Free Essay

Grid of the Future

In: Computers and Technology

Submitted By eg267703
Words 3126
Pages 13
Paper accepted for presentation at 2009 IEEE Bucharest Power Tech Conference, June 28th - July 2nd, Bucharest, Romania
1

New participants in SmartGrids and associated challenges in the transition towards the grid of the future
P. Favre-Perrod, Member, IEEE, R. Critchley, E. Catz & M. Bazargan electricity networks.
Abstract – Different concepts for the long term evolution of electricity networks have been proposed. Visions of large scale, continent-wide interconnections, local scale independent distribution network cells and networks integrating other forms of energy have emerged. The inclusion of new classes of network participants, e.g. prosumers, services providers, transportation applications, regulators and the increase of the number of distributed generators is a common feature of all these frameworks. A series of challenges result from this evolution: the need to coordinate distributed participants, the need to harmonize standards and procedures, as well as the need to overcome a series of obstacles to change. This contribution reviews emerging network concepts and the associated challenges. Series compensation, reconfigurable power electronic systems and wide-scale use of phasor measurement units are early examples for these emerging solutions. Index terms – Power transmission, Power transmission planning

II. CONCEPTS FOR FUTURE ELECTRICITY NETWORKS A. Microgrids In a system comprising distributed electricity generation, consumers and producers may be located within the same distribution system, reducing the need for long distance transmission. Therefore, the concept of microgrids, i.e. small distribution networks with energy sources and sinks of similar magnitudes has been proposed [1]. These network cells can be operated independently from their superordinated networks. This means that energy balancing, voltage and frequency control can be performed locally and that comparatively sophisticated protection and control systems for the (de-) islanding of these cells become necessary. B. Active distribution networks The concept of active distribution networks has been proposed based on the need to adapt the passive distribution infrastructure to the myriad of novel distributed participants expected to appear in distribution systems. Rapid changes in demand and generation, provision of network services by distributed participants, bi-directional energy flows, increased information exchange and intelligent appliances (demand side participation) will require controllable and scalable architectures. Concepts associated with active networks are virtual power plants, reattribution of control duties to network participants and solutions for dealing with information exchange among a very large number of participants (in comparison to the present situation). C. Supergrids Increased long-distance electric energy flows from large offshore wind farms, large scale solar-thermal or photovoltaic plants (e.g. in North Africa) to load centers are an unresolved problem. Several groups have therefore suggested the use of a combination of extra-high voltage or d.c. transmission, partly offshore. This overlaid network layer would provide the necessary interconnection capacity whereas the subordinated network layers would remain in place for (national) distribution. Some authors have also proposed to combine such long

I. INTRODUCTION

Q

UITE a number of concepts for the layout and operation of future energy systems have been proposed in recent years. To respond to the shift towards renewable and stochastic energy sources, increased electricity consumption and the new market organization, a number of novel network concepts have been proposed: supergrids, microgrids, active networks and multi-energy networks. An important factor is the appearance of additional participants in electricity networks: combined consumers/ producers (so-called prosumers: households with own generation, storage, etc.), providers of services (i.e. as opposed to “only” generators), transportation applications (electric vehicles) as well as other applications moving from fossil fuel sources to electricity and regulators. This contribution reviews the major categories of approaches to future energy systems and discusses the issues related to the introduction of new participants into electricity networks, and the resulting necessity for adaptations in current
P. Favre-Perrod is with AREVA T&D, St. Leonards Ave, Stafford ST17 4LX, UK (e-mail: patrick.favre-perrod@areva-td.com) R. Critchley is with AREVA T&D, St. Leonards Ave, Stafford ST17 4LX, UK (e-mail: roger.critchley@areva-td.com) E. Catz is with AREVA T&D, Chemin de la côte, 69802 Saint-Priest, France (e-mail: emmanuelle.catz@areva-td.com) M. Bazargan is with AREVA T&D, St. Leonards Ave, Stafford ST17 4LX, UK (e-mail: masoud.bazargan@areva-td.com)

978-1-4244-2235-7/09/$25.00 ©2009 IEEE

2

distance electricity transmission with hydrogen transmission, possibly as a coolant for a superconducting electrical conductor [2]. D. Multi-Energy networks Since many consumers and producers handle several forms of energy (and not only electricity) and networks of the future are expected to see a higher integration of different energy services including storage, so-called multi-energy networks have been proposed [3]. The underlying intention is to consider all forms of energy when developing an optimal network structure. Fig. 1 shows a possible arrangement of consuming and producing participants connected to the multi-energy network by adapted interfaces called energy hubs. This network encloses several forms of energy, e.g. electric, thermal and chemical.

A. Prosumers Opportunities for businesses and households to cover parts of their needs with own generation will increase in the future. In combination with the introduction of intelligent appliances (demand side participation) this implies that the traditional energy consumer can become a producer at certain times of the day, hence the emergence of the word “prosumer”. B. Services providers Participants might emerge who do no produce or consume energy, but participate to the optimization of network operations by providing services. Such services include energy storage, provision of balancing power (reserve), power quality and possibly reactive power (in sub-transmission networks). C. Transportation applications The public and technical debate on the solutions to make road transportation independent on fossil resources shows that electric cars are a very strong option for the future. Plug-in cars are therefore a potential new network participant. The high amount of energy involved, the storage capacity represented by the cars and the specific spatial “behavior” of these new participants makes them hugely different from other grid participants. D. Regulators As governments’ interests are often no longer represented in the boards of monopolistic state utilities, regulators have been put in place to accompany the re-regulation process. The focus of their interest is security and compliance to legislation. In order to increase the effectiveness of regulation, these new actors are likely to be more actively involved in aspects related to network operations in the future. E. Distributed generators Distributed generators connected to distribution networks are not fundamentally new. Their rising number will however contribute to the factors affecting changes in future networks.

Fig. 1. Illustration of the structure of a multi-energy network. Energy consumers and producers (electrical, chemical and thermal energy) are interfaced by energy hubs which convert, condition and store energy.

III. NOVEL PARTICIPANTS IN FUTURE ELECTRICITY NETWORKS Fig. 2 shows some possible characteristics of the organization of an electric system of the future: new participants (prosumers, service providers, etc.) will use networks to exchange active power, services and information in “multi-lateral” transactions. A sharper distinction between the roles of each participant can be expected (nowadays, active and reactive power are often provided by the same participant, e.g.). This contrasts with the present mainly unidirectional flow of active power: • Since more player (discussed below) will appear in the system, the number of transactions (or exchanges) will increase. • More different types of transactions will occur in the system. Today essentially active power is traded whereas in the future, services markets will emerge. • These transactions will be multi-lateral: from a utility-consumer relationship the system will evolve towards a marketplace involving a broad range of participants.

Data

Policy

EMS/MMS VAR kWh

UNBU

NDLIN G

TSO / ISO

Owners

Storage

Services

kWh

€ VAR kWh kWh VAR









Fig. 2. Participants and transactions in the future electricity transmission and distribution system.

3

IV. CHALLENGES A. Coordination of distributed services The appearance of large numbers of distributed participants raises the question of the aggregated action of dispersed network participants (plug-in cars, generators, smart appliances, etc.). From a system operator’s perspective, these participants have the potential to substitute central plants’ functions by means of their collective and coordinated action. As a consequence, new ways of making the information regarding large numbers of distributed participants available to network operators will need to be developed and integrated into network management systems. These systems will also need to make better use of forecast tools for both stochastic generation and load. Establishing a DSO (distribution system operator) function appears to be key to reach this. B. Harmonization of regulations and operational procedures The inclusion of new participants and network duties will impact on network operation. The following changes can be anticipated: • Mechanisms to make use of demand response need to be established: currently system flexibility is manly provided by centralized power plants; their replacement by renewable and stochastic generators will require the participation of the loads to system balancing. • Islanding, synchronization and reconfiguration of distribution sub-networks needs to be facilitated, since local generation is likely to be sufficient to feed a significant share of local loads in may future distribution networks. This will permit to ensure higher reliability and a faster recovery from outage situations. • Operation of storage and other new small-scale network participants providing services needs to be integrated into grid management tools. The computational challenge of managing this rising number of resources shall not be underestimated. • Integration of a large number of distributed and renewable generators will require plug and play style network connection (thus lowering the associated engineering efforts). A number of prestandardization efforts have been started into this direction. Microgrids solutions have been successfully implemented in the past, e.g. using AREVA T&D’s Pacis substation control system. The technical viability and the added value for sensitive users could thus be established. However, such systems remain the exception in current systems, and more effort will be necessary to encourage utilities to use MicroGrids at a larger scale. A second early example of a modular system permitting the integration of a larger number of distributed participants are D-STATCOM systems. E.g. an SVC MaxSine dynamic shunt compensation device has been delivered by AREVA T&D to a steel processing plant near Abu Dhabi. The 72MVAr AREVA

T&D SVC MaxSine provides high customer benefits: thanks to the improved power quality, the steel processing plant could increase the power it receives from the network, thus reducing the typical tap to tap time (equivalent to one cycle of the arc furnace) from 53 minutes to 49 minutes. This implies a high productivity gain for the customer and more revenues for the local utitily. This example shows that D-STATCOM permit to increase the usage of distribution network. Other application cases, independent of an industrial process are likely to appear in the future, e.g. in the context of integrating large amounts of generation into rural networks, or increasing the amount of electrical energy delivered to urban areas due to the increasing “electrification” of our energy consumption C. Technical standards The following areas of standardization will require adaptations, which include the following: • Information systems, especially new components such as meters; data transmission formats and protocols as well as “physical” interfaces, plugs and space requirements. • Quality of service (especially at the lower voltage levels). • Ancillary services provided by participants: responsive demand, storage, reactive power, filtering, etc. • Type testing and certification of interfacing equipment (distributed generation, energy storage), including proof of “plug & play capability”. Once standards will permit this, the use of multi-functional and interoperable power electronic converters is likely to become more widespread. The HVDCiceTM system developed by AREVA T&D is an early illustration of this. This system is a combination of a static VAR compensator and an HV transmission line de-icing system: in normal operation the system acts like a standard FACTS device and it takes only minutes to automatically reconfigure it to a de-icing system (DC current source). This scheme has been successfully implemented in Hydro Quebec’s transmission network. It has the advantage of reducing the required space and costs for providing each of its services. In this example, the SVC consists of a TCR, an SVC and additional filters. As shown in figure 3, the TCR is the reconfigurable part of the converter, which can be used as a DC current source for the de-icer. D. General barriers for SmartGrids Finally some more general barriers to the transition towards SmartGrids exist: • Conservatism of network operators (e.g. reluctance to adopt decentralized operation or reduce operational margins). This can be explained partly by the failure of solution providers to clearly establish the benefits of novel solutions. On the other hand the downstream consequences of power interruptions cause a high risk aversion of utilities and operators

4

• •

• •

Diverging views of different user groups or equipment suppliers Difficulty to establish the clear advantage of Smart-Grids technologies in “classical” systems (e.g. to compete with existing systems reliability and losses) Failure to identify a strategy for continuous and gradual changes. This is currently being addressed by European policies. Long equipment lifetime. This means that old technology cannot be replaced with new as it becomes available and that all new components need to be compatible with potentially 40 years old existing technology. SVC

automatic switching of shunt reactors, underfrequency load shedding, undervoltage remote load shedding and protection against system separation. Operators are furthermore supported in their task by advanced visualization systems like AREVA T&D e-terra Vision. Series compensation is another means to increase the transmissible power: it is currently used where the transmission distances are very long (e.g. Brazil, Finland, Canada and China). Series capacitors are used in the HV (High Voltage) and EHV (Extra High Voltage) transmission lines to compensate the inductive reactance of the transmission lines. The advantage of a series capacitor is that it automatically compensates the line i.e. the compensation power can be adapted according to the line current. This reactive power increases the power transmission capability and stabilizes the system. Increased power transmission requirements from north to south and increased power export from Canada to the United States have lead to insufficient transmission line capacity in a part of B.C. Hydro’s network. B.C. Hydro decided to increase the compensation level of the existing power transmission line by building a new series capacitor bank. Nokian Capacitor Ltd, and B.C. Hydro signed the supply contract of the Guichon Project in May 2002. The Series Capacitor bank 500kV, 420Mvar, 2400A, 60Hz was put into commercial use in November 2003. The Guichon project increased the current currying capabilities from 1600 to 2400 amperes, improved system stability and reduced losses. It also ensured sufficient power supply in the case of faults in parallel lines. V. CONCLUDING REMARKS

De-icer mode

Fig. 3. Reconfigurable HVDCiceTM TCR. The same power electronic building blocks can be automatically reconfigured to obtain two distinct functions: a TCR (thyristor controlled reactor) or a DC current source for the de-icing of overhead lines.

A number of visions for the long term development of energy systems co-exist and confirm that the addition of new players changes the requirements for the development of future energy systems. This will require a larger agreement among sector participants to respond to the challenges related to the long term evolution of network architectures and operations, as it was initiated e.g. by the European technology platform SmartGrids [4]. Some flagship projects show that advanced features can be added to current electricity system using state-of-the-art technology, but they are still only a few examples. Indeed the SmartGrids technology platform has indentified this and released a deployment plan for the envisioned innovative feature of the future electricity grid [5]. The action of all involved stakeholders is now required. VI. REFERENCES
[1] [2] [3] [4] R.H. Lasseter, “MicroGrids”, Proceedings of the 2002 IEEE Power Engineering Society Winter Meeting, vol. 1, p. 305, 2002. P. M. Grant, “The supercable: dual delivery of chemical and electric power”, IEEE Transactions on Applied Superconductivity, vol. 15(2), p. 1810, 2005. M. Geidl, G. Koeppel, P. Favre-Perrod, B. Klöckl, G. Andersson, and K. Fröhlich, “Energy hubs for the future”, IEEE Power and Energy Magazine, vol. 5, p. 24, 2007. European SmartGrids Technology Platform, “Vision and Strategy for Europe’s Electricity networks of the future”, 2006.

Phasor measurement units (PMUs) represent a forwardlooking means of insuring system stability and realibiltiy depite increased stress. E.g. Hydro Québec has installed 10 units into its network. The PMU system records the harmonics distrortion, phase angle difference, frequency, voltage variation and system status every 5 seconds. These measurements are a cornerstone of the TSO’s defense plan and are used for power rejection and remote load shedding,

5 [5] European SmartGrids Technology Platform, “Strategic deployment document for Europe’s Electricity Networks of the Future”, 2008.

VII. BIOGRAPHIES
Patrick Favre-Perrod was born in Vevey, Switzerland, in 1979. He graduated in electrical engineering and information technology from ETH Zurich, Switzerland. He has written his thesis in the area of future power systems at the high voltage laboratory of ETH Zurich. He is currently a research techologist at the AREVA T&D Technology Centre in Stafford, United Kingdom. His fields of interest include multienergy systems, active electricity networks and novel building blocks for T&D networks. Dr Patrick Favre-Perrod is a member of CIGRE, IEEE and Eletrosuisse. Roger Critchley was born in Stoke-on-Trent, UK in 1947. He joined AREVA T&D (then English Electric) in 1966 as a sponsored student and studied Electrical/Electronic Engineering at Staffordshire University, UK from 1966 to 1970. Since then he has worked extensively in the field of power electronics, mainly in R&D of power electronics based solutions for both industrial and HVDC/FACTS applications. His current role is in AREVA T&D’s Technology Centre where he is responsible for all Power Electronics based research and innovation projects. He is a Member of the Institution of Engineering and Technology (IET). Emmanuelle Catz was born in Paris, France, in 1975. She graduated in Electrical Engineering from Supélec (Gif Sur Yvette, France) in 1999. Since then, she has been working in AREVA T&D, in the fields of High Voltage Substations and Power Electronics applications.

Masoud Bazargan is the General Manager of AREVA T&D Technology Centre in Stafford where he heads a multi-disciplinary team of engineers and scientists working on a wide range of research topics including SmartGrids technologies. Dr Masoud Bazargan is a Chartered Electrical Engineering and since joining the industry, he has been mainly working in the area of Power Systems modeling and analysis. During his career, he has worked for manufacturing as well as utility and consultancy industries.

Similar Documents

Free Essay

The Communication Technologies for Smart Grid

...Technologies for Smart Grid Abstract Smart Grid is next generation power transmission system with advanced communication technologies. This article will make a review of some possible communication technologies for the smart grid. The applications and limitations of these technologies will be introduced and discussed. 1. Introduction Smart grid is next generation of the power transmission system and is a revolution of the old electrical power grid which has been used for about one hundred years. Now there is still not a clear definition of smart grid but some main aims and features of expected smart grid are: observable, controllable, efficient (energy and economy), incorporating renewable and distributed generation, enable demand side operation and the ability of automated. The technologies support the future smart grid can be divided into three parts: 1. Information and Communication Technologies (ICT) 2. Sensing, Measurement, Control and Automation Technologies 3. Power electronics and energy storage Technologies This article will only introduce the current information and communication technologies for the smart grid because of the length restriction. The reliable and stable communication system is a key factor for the power delivery system. Therefore, a communication system that meets the requirements is the foundation to the successful implementation of Smart Grid in the future. 2. Information and Communication Technology (ICT) for Smart......

Words: 1324 - Pages: 6

Premium Essay

Microgrid

...foreseeable future? Paritosh Pramanik Paritosh7@iimk.edu.in Student-Executive Post Graduate Diploma in Business Management Program Indian Institute of Management Kozhikode ………………………………………………………………………………………………………………………….. We all know about power from renewable sources. It is no longer a new thing to be surprised. We have matured-enough technology available. We also know where to implement micro grid using renewable energy sources. Yes, rural area, far away from main grid, is the ideal location. When we talk about renewable energy, solar and wind power first come in our mind. Drawing energy from these sources, micro grid can potentially benefits humans if properly understood. Micro grid is indeed a revolutionary concept that has potential to minimize the dependence to main power grid, especially for the purpose of low to medium wattage consumption. But how to fast utilize the solar or any other form of renewable energy is still not addressed. Let me raise some concerns that are the reasons why solar or other form of micro grid are still not prevalent. Today, carbon emission is a matter of concern. Absolutely true. But how many people actually know that? Or. How many people seriously think about that? Global temperature is rising; many cities can sink under sea-academicians know that. But common people, from developed and developing countries alike, really do not seriously bother about that. Why? Nobody of us actually can neither foresee future nor worry......

Words: 1134 - Pages: 5

Premium Essay

Asadadada

...Off Grid Power Systems & Renewable Energy Resources [Name of the Writer] [Name of the Institution] Off Grid Power Systems & Renewable Energy Resources Introduction With rapid digitalization, modernization and globalization, the technological market is taking over the world for securing a better future. Observing the current levels of environmental degradation across the globe and the depleting ozone layer, the world today is focusing on establishing better and innovative means to overcome such hindrances. The wide range of fuel required to generate electrical power through electrical grid systems overlaid across the globe are adding extensively to the rising concerns related to environmental issues. Electrical grid systems based on fossil fuels are adding up to the vast level of air pollution. Moreover, a large amount of cost is incurred each year in order to keep these power plants operational. They utilize a number of natural resources and can highly impact on land due to prolong mining processes supervised. On the other hand, Nuclear energy resources are resulting in producing a vast amount of radioactive waste leaving the world in a dilemma as in where to dispose the generated waste. The only options that are left now are to shift the perceptions towards acquiring innovative ways to accommodate and sustain renewable energy projects. Research Statement The following research proposal aims to analyze aspects related to generating relevant facts......

Words: 2299 - Pages: 10

Free Essay

Discuss the Smart Grid. Is the Cost Worth the Benefit?

...“Smart grid” generally refers to a class of technology people are using to bring utility electricity delivery systems into the 21st century, using computer-based remote control and automation. (Office of Electricity Delivery & Energy Reliability, n.d.) A key feature of the smart grid is automation technology that lets the utility adjust and control each individual device or millions of devices from a central location. In December 2007, Congress passed, and the President approved, Title XIII of the Energy Independence and Security Act of 2007 (EISA). EISA provided the legislative support for DOE’s smart grid activities and reinforced its role in leading and coordinating national grid modernization efforts. President Obama has announced the largest single grid modernization investment in U.S. history, funding a broad range of technologies to spur the nation's transition to a smarter, stronger, more efficient and reliable electric system. This will promote energy-saving choices for consumers, increase energy efficiency, and foster the growth of renewable energy sources like wind and solar power. Congress enacted the American Recovery and Reinvestment Act of 2009 (Recovery Act) to create new jobs and save existing ones, stimulate economic activity, and invest in long-term growth. The $3.4 billion in investments, as part of the Recovery Act, will be matched by industry funding for a total public-private investment worth over $8 billion. (Office of Electricity Delivery & Energy......

Words: 903 - Pages: 4

Free Essay

Smart Grid

...infrastructure. the SMART GRID: an introduction. How a smarter grid works as an enabling engine for our economy, our environment and our future. prepared for the U.S. Department of Energy by Litos Strategic Communication under contract No. DE-AC26-04NT41817, Subtask 560.01.04 DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor Litos Strategic Communication, nor any of their employees, make any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer or otherwise does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or any agency thereof, or Litos Strategic Communication. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. PRINTED IN THE UNITED STATES OF AMERICA. PREFACE It Is A ColossAl tAsk. But It Is A tAsk thAt must BE donE. The Department of Energy has been charged with orchestrating the wholesale modernization of our nation’s electrical grid. While it is running.......

Words: 13792 - Pages: 56

Free Essay

Grid Energy Storage

...Grid Energy Storage   U.S. Department of Energy          December 2013            Acknowledgements  We would like to acknowledge the members of the core team dedicated to developing this report on grid energy storage: Imre Gyuk (OE), Mark Johnson (ARPA-E), John Vetrano (Office of Science), Kevin Lynn (EERE), William Parks (OE), Rachna Handa (OE), Landis Kannberg (PNNL), Sean Hearne & Karen Waldrip (SNL), Ralph Braccio (Booz Allen Hamilton).     Table of Contents    Acknowledgements  ...................................................................................................................................... 1 . Executive Summary ....................................................................................................................................... 4 1.0   Introduction .......................................................................................................................................... 7 2.0   State of Energy Storage in US and Abroad .......................................................................................... 11 3.0   Grid Scale Energy Storage Applications .............................................................................................. 20 4.0   Summary of Key Barriers ..................................................................................................................... 30 5.0    Energy Storage Strategic Goals ...............................................

Words: 22215 - Pages: 89

Premium Essay

Self-Sustainable Living: Why?

...electricity grid? This study aim to determine the reasons individuals and, in some cases, communities strive to be self-sustainable and free themselves from the electricity grid. Data will be collected form informal interviews with different groups of people that have, are in the process of, or do not want to live a self-sustainable lifestyle as well as using Ethnography and scholarly market studies to gather data on individuals behavior in an unbiased manner. The data will show where the renewable energy industry may be headed in the near future and what drives people to make this drastic life change. Sustainable Living: Why? Introduction This is a qualitative study on the individual and group reasoning behind a drastic lifestyle change that seems to be growing in popularity around the word. Unbiased data will be collected via different forms of methodology in order to discover the thought process and driving force behind this subtle, but dedicated movement to live “off-grid”. Ethnography will be one source of data collection as well as different informal interviews and market analyses. I will present the data collected in this study in such a way, that it may be used for future research to assist in discovering where the residential renewable energy market may be headed in the near future. Literature Review “Living Off the Grid a Simple Guide to Creating and Maintaining a Self-Reliant Supply of Energy, Water, Shelter, and More”: Defines living off grid as a degree......

Words: 1802 - Pages: 8

Free Essay

Grid Computing

...order of thousands around the world; static replication does not sound to be feasible. Dynamic replication strategies overcome the problem, where replica creation, deletion and management are done automatically. Dynamic replication strategies have the ability to adapt to changes in user behavior. Dynamic strategies are explained in section-2. In replication consistency is an important issue that needs to be considered. To overcome this problem as in other papers, it is assumed that: access pattern is read only for all replicas in data grid. The remainder of paper is organized as follows. Related work on replication and scheduling is given in section 3. A 3-layerd hierarchical structure is proposed for replication in data grid based on classification of networks, along with a novel algorithm for this structure is given in section 4. Section 5, covers the simulation result with optorsim and section 6 concludes the paper. Summary In data grids huge amount of data are generated and processed by users around the world. Objective of dynamic replica...

Words: 3673 - Pages: 15

Premium Essay

Invention

...Principal Research Results “Energy Chain”, A New Concept in Evaluating Future Energy Conservation and Greenhouse Abatement Alternatives and Effectiveness Background The energy demand and supply system consists of many kinds of energy subsystems, for example, grid network, fuel (city gas, LPG, kerosene and so on) networks, prospective fuel (hydrogen) networks and demand-side equipments such as heat pump and cogeneration. In recent years, many evaluation methods and factors have been proposed and discussions of energy policy about innovative technology are becoming more multifaceted. In addition, as a result of specialization and segmentation of engineering science, too much discussion has been centered on particular details of efficiency, rather than on the overall needs of the energy supply and demand system. Integration of these evaluations and discussions is necessary for criteria for judgment. Critical review is always necessary to ensure that prospective technologies are really energy saving and contribute to greenhouse abatement over the whole spectrum from producing energy to end-use. Objectives To introduce a new concept of “Energy Chain” from producing energy through transmission, utilization and end-use, and to propose engineering methodology and evaluation method with examples. Principal Results 1.Proposing a New Concept of Energy Chain and Evaluation Method What the energy end-user needs is “energy benefit”. This include all kinds of benefit 1 that......

Words: 1413 - Pages: 6

Free Essay

Power Grid Crash in India

...Power grid 1 Red tape meets black wire Just a few days ago 10 per cent of the world’s population faced a series of power cuts – India’s Northern and Eastern grids came to halt and 600 million people were confronted with the delicate state of their nation’s electricity grid. The reason for the power failure is complex, and you can read more detail below, but essentially it came down to one thing: the power system had recently been transformed from a system to move electricity around this massive country into a system to trade electricity. “Power stations, which earlier had to be very sensitive to shifts in demand within their region over the course of the day, can now export their surpluses to where its needed,” the Economic Times proudly announced today. “But the pricing mechanisms and regulatory frameworks need to match up with the physical development. Bigger systems require better regulatory oversight – the costs of failure can be huge in a large system,” it says. These days, India has something approaching one national grid, since a decision last decade to bolt together several regional grids. And the connections joining these sub-grids together are both too complex to be managed easily, and insufficient to handle partial failures elsewhere in the system. The solution is to diversify the power supply from the current state-owned monopolies to allow private investment of every size and kind – particularly the establishment of micro-grids based on renewable......

Words: 2065 - Pages: 9

Premium Essay

Smart Grid Advantages And Disadvantages

...Smart Grid: It’s a network that is linked with digital communication to detect and react to changes in usage to provide electricity is called smart grid. This modern technology made efficiency, reliability sustainability of the production and the distribution of electricity a lot easier. Electric utilities have found themselves making three classes of transformation: improvement of infrastructure, called the strong grid in China; addition of the digital layer, which is the main priority of smart grid; and business process of modernization that has been going on in the modernization of the electric grid, the substation and the distribution automation now included in the general concept of the smart grid, but it is evolving as well. The demand...

Words: 700 - Pages: 3

Free Essay

Electrical Design

...storage devices, renewable energy and use of distributed generation. Micro-grid paradigm can deal effectively with the ever increasing electricity needs. This paradigm is bestowed with the ability to regulate the electricity flow. This is achieved through the generation and distribution mechanisms. Grid refers to different interconnection of different electricity transmission lines. The line does not necessarily need to be transmitting electricity of equal magnitudes. But the electricity of different magnitude that runs from the highest to the lowest magnitude possible. In short, the grid connects the consumers to the electricity supply utilities (Vittal & Ayyanar, 2013, pg. 162). The renewable energy integration into the main grid can take place in the distribution or at the transmission levels. The point at which integration takes place depends on the size or the scale of the electricity generation. Large generating stations directly feed the main grid. Unlike large generating stations, the small distributed generations feed the low or medium voltage lines. The design on each of the interconnection techniques to be used depends on the future and present challenges. Discussion Basic principle of operation Heat Recovery System Heat Recovery System Micro-Turbine (CHP) Micro-Turbine (CHP) Distributed generation (DG) is composed of generation of power and interfacing with the main grid. Interfacing is achieved by use of...

Words: 1761 - Pages: 8

Free Essay

La Heuao Hduei Mdna Mel O Pd

...[1] SMART GRID: A Caminho da Rede Inteligente <http://www.cpqd.com.br/highlights/4368-smart-grid-a-caminho-da-rede-inteligente.html> acessado em 23.7.2011 às 11h23 [2] Réflexe, a Smart Grid project led by Veolia Environnement, is selected for France's future investments program' <http://www.veolia.com/en/medias/press-releases/reflexe.htm> acessado em 23.7.2011 às 11h31 [3] National Smart Grid Policy: Moving Toward a National Modernized Electrical Grid through Current Pilot and Demonstration Programs <http://pip.collegethink.com/media/files/papers/Scott_09_r.pdf> acessado em 23.7.2011 às 11h46 "O que foi projetado para atender a uma realidade do século XX, seguramente não conseguirá acompanhar satisfatoriamente as tendências de demanda do século XXI, onde o consumo de energia elétrica insiste em crescer a taxas sempre mais elevadas que o próprio PIB dos países."[1] "The Department of Energy (of USA) has identified three major problems of the electric grid: unreliability, inefficiency and enormous greenhouse gas emissions during electricity generation." [3] "As Americans use more and more electricity via electric vehicles, computers or iPods, the demand is surely out weighing the supply. This causes strain and congestion on the electric grid." [3] "the grid lacks efficiency. Most of the energy that is lost within the electrical grid is in the form of heat. However, if a five percent increase in the efficiency......

Words: 598 - Pages: 3

Free Essay

English 410 - Future of the Internet

...The Future of the Internet Just as the internet revolutionized how the world accessed information and communicated through the 1990's, the ongoing development in speed, bandwidth, and functionality will continue to cause fundamental changes to how our world operates for decades to come. Some of the major trends shaping the future of the Internet are summarized below, along with extrapolated predictions: * Globalism. The future of the Internet global distribution of information and knowledge at lower and lower cost will continue to lift the world community for generations to come. People will have access to any information they wish, get smarter sooner, and be more aware of the world outside their local environment. * Virtual reality. The future of the Internet technological revolution will continue to be made in man's image. Experiments with wide area voice and video communications on the Internet began to be held in the early 1990's. Voice over IP (VOIP) began to be used regularly for long distance voice communications in 2002. Internet video phones won't be far behind. With the continued doubling of computer capability every couple of years, the ability of technology to process the complex analog environment that humans live in -- "reality" -- will continue to increase, and will be increasingly integrated with the Internet.  Three dimensional graphics (3D) will become more sophisticated, and virtual reality interfaces such as viewers and tactile feedback......

Words: 596 - Pages: 3

Free Essay

Smart Grid

...Smart Grid: Focus Areas Smart Grid The current electric grid was conceived more than 100 years ago when electricity needs were simple. Power generation was localized and built around communities. Most homes had only small energy demands such as few light-bulbs and a radio. The grid was designed for utilities to deliver electricity to consumer's home and then bill them once a month which is a one-way communication which is illustrated in figure 1; Before smart Grid. Figure 1: Pre and Post Smart Grid communication This limited one-way interaction makes it difficult for the grid to respond to the ever changing and rising energy demands of the 21st century. The smart grid introduces the two-way dialogue where electricity and information can be exchanged between utility and its customers shown in figure 1; After smart grid . Its a developing network of communications, controls, computers and automation, and new technology and tools working together to make the grid more efficient, more reliable, more secure, and more greener. The smart grid enables newer technologies to be integrated such as wind and solar energy production and plug-in vehicle charging. With our participation as informed consumers, the smart grid will replace the old infrastructure of today's grid. And utilities can better communicate with us to help manage our electricity needs. Grid Situational awareness Situational awareness in the context of power grid operation is......

Words: 846 - Pages: 4